package com.example.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;

import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * job为多线程任务
 *
 * @author Sheeper
 * @date 2019/4/16.
 */
@Configuration
public class ScheduleConfig implements SchedulingConfigurer {
    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        //配置核心线程数
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        int corePoolSize = 12;
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(15);
        //配置队列大小
        executor.setQueueCapacity(200);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix("async-job-");

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());

        taskRegistrar.setScheduler(new ScheduledThreadPoolExecutor(corePoolSize, executor));
    }
}
